Ophryotrocha hartmanni
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 1,754
Described in 1933
12 species
Calliopum simillimum
- Group
- True flies
- Peak month
- June
- Records since 2000
- 221
Caulacanthus okamurae
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 147
Ocys tachysoides
- Group
- Beetles
- Peak month
- December
- Records since 2000
- 134
Speccafrons halophila
- Group
- True flies
- Peak month
- June
- Records since 2000
- 106
Dicraeus fennicus
- Group
- True flies
- Peak month
- July
- Records since 2000
- 100
Sphaerodoridium balticum
- Group
- Worms (annelids)
- Peak month
- May
- Records since 2000
- 84
Megaselia fuscovariana
- Group
- True flies
- Peak month
- July
- Records since 2000
- 82
Cryptonevra nigritarsis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 76
Colliniella meijerei
- Group
- True flies
- Peak month
- July
- Records since 2000
- 60
Telmatogeton japonicus
- Group
- True flies
- Peak month
- April
- Records since 2000
- 58
Microlaimus marinus
- Group
- Roundworms
- Peak month
- May
- Records since 2000
- 52